Double-Angle and Half-Angle Identities

1
Double-Angle and Half-Angle Identities

• Section 5.3

2
Objectives

• Apply the half-angle and/or double angle formula
  to simplify an expression or evaluate an angle.
• Apply a power reducing formula to simplify an
  expression.

3
Double-Angle Identities
4
Half-Angle Identities
5
Power-Reducing Identities
6
Use a half-angle identity to find the exact
value of
7
If find the values of the following
trigonometric functions.
8
If find the values of the following
trigonometric functions.
9
Use the power-reducing formula to simplify the
expression
Is there another way to simplify this without
using a power-reducing formula?